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- Longwall mining along the dip of the unstable coal seam and strata control 不稳定煤层倾斜长壁开采及矿压控制
- coal seam and strata 煤岩层
- Keywords Ordos basin;Dongsheng coalfield;coal seams and strata correlation; 关键词鄂尔多斯盆地;东胜煤田;煤岩层对比;
- The occurrence of rock burst not only need a great deal of elastic energy gathering in the coal seam and the around rock stratum, but also the external energy released by the main key stratum break. 冲击矿压的发生需要煤层及其周围岩层中聚集大量的弹性能外，还需要主关键层破裂等释放的外部能量；
- Through analysis to sedimentary condition of stratum coal measures,deposit state and changing regular of coal seam were known,it has directive significance to mining coal seam and safety producfion. 通过对煤系地层沉积环境进行分析,可以了解煤层的赋存状态及其变化规律,对煤层的开采和安全生产具有指导意义。
- coal seam and rock stratum contrast 煤岩层对比
- The paper introduces the sedimentary environment of coal and coal?bearing strata,the properties of coal seams and the causes resulted in the variation of seam thickness in laung mining district,Kalimantan Tengah,Indonesia. ? 介绍了印尼中加里曼丹拉翁煤矿区煤和含煤岩系的沉积环境、煤层特征以及引起煤厚变化的原因。
- An inversive research method was proposed through analyzing the complicated changing features of permeability of coal seam and the problems existing in actual measurement. 分析了煤层渗透率的复杂变化特点和实际测量上存在的问题，提出其反演方法。
- It was discovered that the gallium is more than marginal grade in content and enriched in lower coal seam and floor, and occurs mainly in diaspore. 发现样品中镓的加权平均含量超过边界品位，并在煤层下部和底板岩石中显著富集，其主要地质载体为硬水铝石。
- Under the tectonic stress,the deformations of coal seams and the adjoining rock strata infault-block structural area are of good coordination and close correlation. 断块构造区域内煤层及其周围岩层在构造应力作用下的形变具有很好的协调性和密切的相关性。
- The inversive calculation result showed that the permeability coefficient of coal seam and its changing condition can be determined by seam gas Pressure. 算例反演的结果表明，利用反演方法能够通过煤层瓦斯压力确定煤层的透气性系数及其变化状况。
- The inrush mechanisms of high pressure groundwater from floor of coal seam and gob areas, as well as related preventing technology are the study emphases. 重点分析了深部煤炭资源开发过程中高承压水底板突出机理及其防治技术和废弃矿井老空水突出机理与防治技术。
- From the characteristic of prop and actual conditions of coal seam and roof in Datai pithead, the support force of the dense prop in 揝ichuan Method?is calculated. 从单体液压支柱的特性出发,结合大台井实际的煤层和顶板条件,计算了俯伪斜走向分段密集采煤法密集柱的支撑力。
- The relationships between the permeability of the methane gas in coal seam and surface fractal dimension and tortuosity fractal dimension are proposed based on fractal theory and Darcy Law. 基于分形理论和达西定律,研究了孔隙的弯曲分形维数和表面积分形维数与瓦斯渗透率参数之间的关系;
- This paper analyzes on the influence of the variation in thickness of coal seam and the supporting method on the coal quality,and based on this,advances some measures for reducing the gangue production to improve the coal quality on the tunneling faces. 分析了煤层厚度变化和支护方式对煤质的影响,在此基础上提出了若干减少出矸以提高掘进工作面出煤质量的措施。
- Th e paper discusses igneous rock lithological features,spatial distributive charact ers and its influence on coal seam and coal quality of Huanghebei coalfield,Sha ndong Province. 论述了山东省黄河北煤田岩浆岩特性特征、空间分布特点及其对煤层煤质的影响。
- This paper points out that the danger of coal and gas outburst is greatly increasing along with the depth of the coal seam and the intensity of the coaling. 随着矿井开采水平的延伸,开采强度的提高,煤与瓦斯突出危险程度也在不断增加;
- Visible armhole seam and zig-zag shaped. 夹位露缝线及起蛇。
- State Analysis and Strata Controlling Technology in Roof Movement of Longwall Workings under the Stoops of Adjacent Coal Seam 近距煤层刀柱下长壁开采顶板活动形态及控顶技术
- The Main Chromitite Seam and the Merensky Reef do not outcrop well. 主铬铁岩矿层及麦仑斯基矿层出露不好。
